运用DSAS和SMC分析人工岛建设对岸线变化的影响

The Analysis of Shoreline Changes Respond to Artificial Island Project of Dongjiao Coco Forest Based on DSAS and SMC

海南岛东郊椰林人工岛建设于砂质海岸外,对海岸线变化有非常大的影响。选取5景遥感影像,运用DSAS数字岸线分析系统分析人工岛建设前后岸线变化,同时利用SMC模拟系统分析人工岛建设前后水动力变化情况,用于分析研究泥沙运移趋势。结果表明人工岛建设后,该海岸西段人工岛与陆地之间海域波浪场明显减弱,而沿岸流则由人工岛建设前的自东向西,变为人工岛建设后后两股沿岸流在岛体后方相汇,利于此处泥沙堆积。通过岸线变化分析,人工岛建设之后西段岸线受人工岛的遮蔽由侵蚀转变为淤积,最大淤积速率可达70m/a,形成现在向海凸出沙嘴,最终将演化为连岛沙坝,东段岸线接受不到岛体的庇护则仍表现为侵蚀状态。

Artificial island was constructed off sand coast,and it has a great impact on the shoreline changes.In this paper,we analysed the shoreline changes before and after artificial island project by using DSAS based on 5 remote sensing data.And we analysed the hydrodynamic changes before and after artificial island project by using SMC.The result show that,the wave field is obviously weakened between artificial island and land.The longshore current is also changed,the currents traveled from east to west before the project,and now,they travel together at the back of the island,so it is beneficial to deposit.The shoreline changes analysis showed that it changed from erosion to deposition at the west of coast after the project,the maximum deposition rate reached 70m/a,and formed a sand spit bulging seaward,and it will finally evolve into tombolo.The easten coast still show erosion.